Ever think to yourself, man, being mesmerised by a digital music visualiser is just too safe? Fixing that problem is easy: just add fire. Also, science.
OK, speaking seriously, this fire visualiser made by the folks at Hard Science is really cool. You can watch them make it (and then test it) in the video, and you can even build one yourself, if you'd like. Just make sure to use lots of propane and get really close to the flames for added excitement if you build one. (Don't actually do that.)
Visualising Dubstep with a Tube of Fire [Hard Science]